samwalshnz and danilowoz New `primaryOpacity` and `secondaryOpacity` props to work around Safa…
…ri rgba bug (#96)

* Safari and iOS transparency workaround

Introduction of `primaryOpacity` and `secondaryOpacity`

* Remove primaryOpacity/secondaryOpacity conditional props type

* Add tests for primaryOpacity and secondaryOpacity
Latest commit 3a72b14 May 9, 2018